Analysis Overview

This analysis quantifies relationships between SPCC 1.0 Refined Smoothed Roadway Segments and flood hazard areas identified in FEMA’s Flood Insurance Rate Map (FIRM). For this analysis, FIRM GIS data for the state of Florida were obtained from the FGDL data repository in March 2021. This analysis identified the floodplain of each roadway segment using the roadway centerline’s relationship to FIRM polygons.

Mapping

SPCC 1.0 Segments by Floodplain Designation

Tables and Charts

Floodplain Designations by SPCC 1.0 Refined Smoothed Classification

The following table and charts present the presence of the five FEMA floodplain classifications for each SPCC 1.0 Refined Smoothed classification.

SPCC 1.0 100-Year Floodplain 500-Year Floodplain Open Water Outside Floodplain Undetermined
C1 - Natural 578,930 29,462 1,225 1,286,851 304,946
C2 - Rural 547,684 50,376 NA 2,000,444 105,457
C3C- Suburban Commercial 375,450 306,268 NA 1,817,626 NA
C3R - Suburban Residential 913,531 1,002,877 NA 4,578,678 62,882
C4 - Urban General 963,239 1,795,710 NA 3,401,447 NA
C5 - Urban Center 33,538 38,217 NA 56,099 NA
C6 - Urban Core 28,926 24,474 NA 27,932 NA
Special District 15,231 7,362 NA 46,193 NA

The following table presents the same data as above, but instead of absolute linear feet of roadway per quantile, the table provides the percent breakdown of all floodplain classifications across each SPCC category.

SPCC 1.0
0-Vehicle Household Density Quantile - Percent
SPCC 1.0 100-Year Floodplain 500-Year Floodplain Open Water Outside Floodplain Undetermined
C1 - Natural 26.3% 1.3% 0.1% 58.5% 13.9%
C2 - Rural 20.3% 1.9% NA 74.0% 3.9%
C3C- Suburban Commercial 15.0% 12.3% NA 72.7% NA
C3R - Suburban Residential 13.9% 15.3% NA 69.8% 1.0%
C4 - Urban General 15.6% 29.1% NA 55.2% NA
C5 - Urban Center 26.2% 29.9% NA 43.9% NA
C6 - Urban Core 35.6% 30.1% NA 34.3% NA
Special District 22.1% 10.7% NA 67.2% NA